Final answer:
Cell theory consists of the ideas that all living things are made up of cells, cells are the fundamental unit of life, and new cells arise from existing cells.
Step-by-step explanation:
Cell theory includes several fundamental statements about the biological nature of cells:
- New cells are made from preexisting cells, which divide into two.
- All living things are composed of cells.
- Cells are the most basic building units of life.
Therefore, the correct answer to which statements are included in cell theory would be "4) All of the above."